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Table 6 Showing the correlation coefficients (p-values) between the sleep variables and scores on other variables at baseline

From: Ambient bright light treatment improved proxy-rated sleep but not sleep measured by actigraphy in nursing home patients with dementia: a placebo-controlled randomised trial

  Age No. drugs No. psychotropic No. sedatives MMSE FAST CCI
WASO −.18 −.03 .04 −.06 −.03 .01 .03
TST day −.01 −.01 .04 −.18 .04 −.05 −.05
TST 24 h .02 .05 .09 −.15 .07 −.12 −.08
SE .01 .01 .02 .01 .09 −.11 −.04
SDI −.12 .30* .35** .19 −.03 −.05 .07
  1. Note: The significance level was set to p < .05. Italics indicate non-normal data. Any pair with non-normal data was analysed using Spearman’s rho (italics). Normal data was analysed using Pearson correlation
  2. CCI Charlson Comorbidity Index, FAST The Functional Assessment Staging, MMSE Mini Mental State Examination, TST total sleep time, SDI Sleep Disorder Inventory, SE sleep efficiency, WASO wake after sleep onset
  3. *Significant at p < .05
  4. **Significant at p < .01